On 09/05/2012 4:03 AM, Wincent wrote:
Dear all, is there any function to assert whether a file path is
legitimate, and to convert any potential file path to a legitimate
file path?
I automate a batch of files and write them to plain text files with
cat(). The file argument of cat() is generated automatically which may
contain characters such as ?< >, unacceptable in Windows OS. What I
do at this moment is to strip such characters off with gsub(). Is
there any direct way to make legitimate file path without detailed
knowledge about the naming rule specific to a OS?
I would just try to create the file, and if you fail, it's not
legitimate. Alternatively, you could look at the tests that R uses when
it checks a package: we try to keep filenames portable to all operating
systems. The rules seem to be strictest for vignettes:
## we specify ASCII filenames starting with a letter in R-exts
## do this in a locale-independent way.
OK <-
grep("^[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz][ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789._-]+$",
vignettes)
Duncan Murdoch
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